Yes, by law you can be fined if you go around and feed the monkeys. Here is an article: Judge sets S$3,000 as benchmark for fines for monkey feeders

So remember, if you see a cute little monkey and you feel the urge to feed it, don’t. The anti-monkey police will come and have you arrested and you will be fined a few thousand dollars. You know why? Well, apparently the monkeys will become too dependent on humans who feed them and they will start to become a nuisance, just like those religious people who cannot stop talking about how great their god is. And if that happens, the moneys will move out of their habitat and invade human residence to find food. We won’t want dangerous hungry monkeys to start roaming about our housing board flats, now don’t we? Just imagine coming home one day to find that all your precious rice has been eaten by a family of monkeys and they left a few souvenirs behind! I have also seen some very aggressive monkeys at MacRitchie which had attacked children in group. Luckily, no one was hurt as the monkeys only attempted to grab at the food.

So the government has since started a number of campaigns to remind and educate the people NOT to feed the monkeys. But I think that they didn’t do enough. A few signages will not deter monkey lovers from feeding the monkeys. I guess some people just can’t help but to feed the cute little monkeys. I guess if I saw a monkey and I had a banana, I would be very tempted to feed it too. Just like when I am in an online forum and when I spotted a monkey, I will be very tempted to feed it as well. I think it’s just our human nature to want to feed monkeys and I guess it’s the monkey’s nature to want to eat what we humans feed them. Humans and monkeys - match made in heaven. They should have a hotel just for humans and monkeys to do their thing.